This lecture covers the different types of biomass gasifiers, such as pulverized biomass, entrained flow, and fluidized bed gasifiers, explaining their working principles and product gas compositions. It also delves into the fluidized bed gasification process, the dual fluidized bed gasification system, and the sorption enhanced reforming technology. Furthermore, it discusses the gas treatment in dual fluidized bed gasification and the two-step gasification process, highlighting the importance of catalysis for emission control and energy production.